Pneumonia is a common acute respiratory infection that affects the alveoli and distal airways and typically presents with symptoms such as chest pain, cough, dyspnea, and fever. However, it can also manifest with nonspecific symptoms like abdominal pain. This case report presents a previously healthy 24-year-old male who initially presented with severe right upper quadrant abdominal pain and fever. Despite initial treatment, the patient's condition worsened, with the emergence of dyspnea and productive cough. Subsequent examination and imaging revealed community-acquired pneumonia (CAP) caused by Streptococcus pneumoniae. The diagnosis was confirmed through clinical examination, chest X-ray showing a right lower lobe infiltrate, and sputum analysis. The patient was successfully treated with intravenous fluoroquinolone and oral antibiotics upon discharge. This case underscores the importance of considering CAP in the differential diagnosis of acute abdominal pain to avoid misdiagnosis and ensure timely treatment. It highlights the need for awareness of atypical presentations of CAP.

Community-acquired pneumonia (CAP) is a leading cause of hospitalization and mortality, with Streptococcus pneumoniae as a leading cause. Chest radiography, the standard initial imaging modality, can miss early complications, which lead to delays in diagnosis and treatment. Computed tomography (CT) provides greater detail in identifying complications. We report a 67-year-old male with chest pain who was treated in an outpatient setting with oral antibiotics for suspected CAP; however, he experienced clinical deterioration, including fever, cough, weight loss, and worsening respiratory symptoms. Repeat chest X-ray revealed increased lung opacities, prompting a CT thorax, which revealed a large pulmonary abscess not visualized on prior imaging. Failure of outpatient management required inpatient admission with intravenous antibiotics and CT-guided percutaneous drainage. A total of 450 mL of purulent fluid was drained, and cultures grew Streptococcus intermedius. The patient improved and was given targeted antibiotics. This case highlights the importance of considering less common pathogens such as S. intermedius in patients with prolonged symptoms or failure of outpatient therapy. CT imaging should be considered in patients who fail to improve, thus expediting diagnosis and guiding management. S. pneumoniae typically causes acute pneumonia with lobar consolidation. S. intermedius often causes necrotizing abscesses and empyema, often with a longer, more subacute presentation. Differentiating the two on initial presentation is quite difficult, as in our patient's case.

SARS-CoV-2 infection triggers a strong inflammatory response, and persistent symptoms after recovery are thought to reflect prolonged systemic dysregulation. However, mechanisms underlying long COVID remain unclear. This study evaluated longitudinal changes in cytokine hematological and biochemical parameters up to nine months after hospitalization for COVID-19 and examined their relationship with persistent symptoms, vaccination status, and the occurrence of comorbidities. Long COVID patients showed sustained elevations in IL-2, IL-6, IL-10, IL-17A, CXCL9, TNF-α, and IFN-γ compared with healthy controls, exhibiting heterogeneous temporal trajectories. Specifically, levels of IL-2, IL-10, TNF-α, and creatinine continued to increase over time, whereas IFN-γ, LDH, CCL2, CXCL9, and CXCL10 declined. Other parameters exhibited greater variability without a uniform longitudinal pattern. IL-6 demonstrated consistently high diagnostic performance in distinguishing individuals after COVID-19 from healthy controls (AUC > 0.82). Aging substantially affects cytokine profiles and systemic inflammatory status; therefore, residual age-related confounding cannot be fully excluded despite statistical adjustment. Although symptoms such as fatigue, cough, and dyspnea were still reported at nine months, no stable associations were identified between cytokine concentrations and clinical manifestations. These findings indicate that while immune alterations persist long after acute infection, systemic cytokine measurements alone may be insufficient to explain the presence or persistence of symptoms. The results suggest that long COVID reflects multifactorial processes extending beyond systemic inflammation and highlight the need for further research into mechanisms driving long-term long COVID sequelae.